@ morli
sharp eyes . yes one is a "pusher" prop and contra-rotates . I use in runners because they are more efficient , because the air gap is smaller in volume then a comparable out runner .
@ michel
Its all about the air gap between rotor and stator, in an out runner the total air gap is larger. the air gap produces a large "voltage" drop .
Morli,
wow, thank for taking the time to elaborate. I agree with every point you made. The main reason for my previous post was to be sure that people were not deterred from attempting to duplicate/replicate Wayne and the Tube Plane team's work in their own way and I hope that I did not come across as anything else. Which is another point you hit upon, how great it is that they have chosen to share the images with us as it has certainly inspired many people. Granted it would be difficult for most of us with out access to that kind of equipment to even come close to the achieving that level of fit, finish and economy of design.
Can't wait to see it finished!
Craig,
I am using a modifid version of the polly pusher found here:
the fuse can be made as large as you need or out of alternative materials (tubes)
the beauty is the fact that the wings start out as walmart gliders ($3) and by adding spruce spars and nice trailing edges you get a really nice clark Y airfoil. I used carbon tubing for one of my wings, not sure how much of a difference it made. here's an example from rcgroups.
Comments
Is that with quite a bit of weight up front??
What chance a copy of the XFLR5 file as this post made me download it and start fiddling with it!! Still a bit lost. I had not heard of it before.
G
the test went great , it flies like a dream .more testing to come . it is one slick plane .
sharp eyes . yes one is a "pusher" prop and contra-rotates . I use in runners because they are more efficient , because the air gap is smaller in volume then a comparable out runner .
plane is done and ready for test flight . Thursday weather permitting.
Its all about the air gap between rotor and stator, in an out runner the total air gap is larger. the air gap produces a large "voltage" drop .
wow, thank for taking the time to elaborate. I agree with every point you made. The main reason for my previous post was to be sure that people were not deterred from attempting to duplicate/replicate Wayne and the Tube Plane team's work in their own way and I hope that I did not come across as anything else. Which is another point you hit upon, how great it is that they have chosen to share the images with us as it has certainly inspired many people. Granted it would be difficult for most of us with out access to that kind of equipment to even come close to the achieving that level of fit, finish and economy of design.
Can't wait to see it finished!
I am using a modifid version of the polly pusher found here:
the fuse can be made as large as you need or out of alternative materials (tubes)
the beauty is the fact that the wings start out as walmart gliders ($3) and by adding spruce spars and nice trailing edges you get a really nice clark Y airfoil. I used carbon tubing for one of my wings, not sure how much of a difference it made. here's an example from rcgroups.
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